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johnruina
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physics/Work Energy and Power/Potential Energy.md
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[[Work Energy and Power]]
megumi energy
# SUMMARY
# Summary
* potential energy refers to multiple objects in a system affecting each other with conservative forces
* In MY words, potential energy is j stored kinetic energy that something has due to its surroundings, and it cashes it out and converts the PE to KE.
* Scalar
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* Gravitational potential energy between 2 spherical masses: $U_g=-G\frac{m_1m_2}{r}$. Near surface approximation: $\Delta U_g=mg\Delta y$
* For a system with more than 2 objects, potential energy is sum of energy of every pair.
## Zero Potential Energy Definition
# Zero Potential Energy Definition
* Can define zero PE as any convenient reference point
* For gravitational PE, a common ref point is ground level.
* Springs equilibrium is the natural zero PE point.